AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

Figure 21-14. Differential Measurement Range

Output Code

0x1FF

AT90PWM2/3/2B/3B

- VREF/Gain

0x000

0x3FF 0

VREF/Gain

Differential Input

Voltage (Volts)

4317K–AVR–03/2013

0x200

Table 21-2. Correlation Between Input Voltage and Output Codes

VADCn

VADCm + VREF /GAIN

VADCm + 0.999 VREF /GAIN

VADCm + 0.998 VREF /GAIN

...

Read code

0x1FF

0x1FF

0x1FE

...

Corresponding decimal value

511

511

510

...

VADCm + 0.001 VREF /GAIN

VADCm

VADCm - 0.001 VREF /GAIN

...

0x001

1

0x000

0

0x3FF

-1

...

...

VADCm - 0.999 VREF /GAIN

VADCm - VREF /GAIN

0x201

0x200

-511

-512

Example 1:

– ADMUX = 0xED (ADC3 - ADC2, 10x gain, 2.56V reference, left adjusted result)

– Voltage on ADC3 is 300 mV, voltage on ADC2 is 500 mV.

– ADCR = 512 * 10 * (300 - 500) / 2560 = -400 = 0x270

246

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